Erase Sharpie Marks on a White Board.
Step 1: Oops...
Oops! You just used a Sharpie on your White board instead of a Dry Erase Marker.
Step 2: Draw Over Sharpie Writing With a Dry Erase Marker
Scribble over the Sharpie Writing with a Dry Erase Marker.
Step 3: Wipe Off!
Wipe off with a eraser or a paper towel. And poof! The Sharpie writing is gone!
Step 4: Wait ... Its Still There
If there is still faint writing just scribble over it in dry erase marker again. Now it should be gone.